Probable what is happening is that we have much more dynamic lives than before. I mean, we have access to do more information, and are able to do more things than before.
That's why today is easy to feel tempted to have a new partner compared to a few decades ago. Today we just need to turn on our smartphone and we have access to hundreds of possible new partners...
Either way, family is a basic part of our society, the best way to grow up is having a home with mom and dad, so I think people should really test the waters for a few years before going full with marriage and having children.
True @dedicatedguy, we have so many options out there and the social media is kind of luring people into it. People connect with each other even without seeing each other or knowing much about each other, but that's where the values come into picture. You can keep hopping around or choose to have your own nest and settle in it.